(19)
(11) EP 0 293 196 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
31.01.1990 Bulletin 1990/05

(43) Date of publication A2:
30.11.1988 Bulletin 1988/48

(21) Application number: 88304769.8

(22) Date of filing: 26.05.1988
(51) International Patent Classification (IPC)4: F16H 45/02, B60K 41/22, F16H 37/02, F16H 47/06
(84) Designated Contracting States:
DE GB IT NL

(30) Priority: 28.05.1987 JP 134463/87

(71) Applicant: FUJI JUKOGYO KABUSHIKI KAISHA
Tokyo (JP)

(72) Inventor:
  • Sakai, Yasuhito
    Higashimurayama-shi Tokyo (JP)

(74) Representative: Kirk, Geoffrey Thomas et al
BATCHELLOR, KIRK & CO. 2 Pear Tree Court Farringdon Road
London EC1R 0DS
London EC1R 0DS (GB)


(56) References cited: : 
   
       


    (54) System for controlling the pressure of oil for a continuously variable transmission


    (57) A continuously variable transmission has a torque converter (14) with a lockup clutch (19). A high pressure oil pump (70) is provided adjacent the transmission and a low pressure oil pump (72) is provided adjacent the torque converter. A line pressure control valve (100) is provided for controlling the pressure of oil supplied from the high pressure oil pump (70) to produce a line pressure for operating the transmission. A lockup control valve (170) operated by low pressure oil supplied from the low pressure oil pump (72) is provided for controlling the lockup clutch, and a solenoid operated valve (179) is provided to generate a converter condition pressure for operating the lockup control valve and thereby operating the lockup clutch. The converter condition pressure is applied to the line pressure control valve (100) to increase the line pressure.







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